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Note 6 - Pension, Postretirement and Postemployment Defined Benefit Plans (Tables) | 9 Months Ended
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Jun. 27, 2021
Pension Plan [Member] |
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
PENSION PLANS |  | 13 Weeks Ended |  |  | 39 Weeks Ended |
|  | June 27, |  |  | June 28, |  |  | June 27, |  |  | June 28, |
(Thousands of Dollars) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service cost for benefits earned during the period |  |  | 633 |  |  |  | 626 |  |  |  | 1,899 |  |  |  | 737 |
Interest cost on projected benefit obligation |  |  | 1,787 |  |  |  | 2,462 |  |  |  | 5,361 |  |  |  | 5,113 |
Expected return on plan assets |  |  | (4,672 | ) |  |  | (4,356 | ) |  |  | (14,016 | ) |  |  | (8,628 | )
Amortization of net loss |  |  | 1,004 |  |  |  | 792 |  |  |  | 3,013 |  |  |  | 2,376 |
Amortization of prior service benefit |  |  | — |  |  |  | (2 | ) |  |  | (1 | ) |  |  | (6 | )
Pension benefit |  |  | (1,248 | ) |  |  | (478 | ) |  |  | (3,744 | ) |  |  | (408 | )
POSTRETIREMENT MEDICAL PLANS |  | 13 Weeks Ended |  |  | 39 Weeks Ended |
|  | June 27, |  |  | June 28, |  |  | June 27, |  |  | June 28, |
(Thousands of Dollars) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service cost for benefits earned during the period |  |  | 240 |  |  |  | 232 |  |  |  | 690 |  |  |  | 268 |
Interest cost on projected benefit obligation |  |  | 239 |  |  |  | 346 |  |  |  | 601 |  |  |  | 523 |
Expected return on plan assets |  |  | (252 | ) |  |  | (265 | ) |  |  | (756 | ) |  |  | (795 | )
Amortization of net gain |  |  | (172 | ) |  |  | (186 | ) |  |  | (516 | ) |  |  | (558 | )
Amortization of prior service benefit |  |  | (162 | ) |  |  | (161 | ) |  |  | (485 | ) |  |  | (483 | )
Curtailment gain |  |  | — |  |  |  | — |  |  |  | (23,830 | ) |  |  | — |
Postretirement medical benefit |  |  | (107 | ) |  |  | (34 | ) |  |  | (24,296 | ) |  |  | (1,045 | )

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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